Propagating Bulbs from Offsets — Splitting the Daughter Bulbs

A bulb is a whole plant in miniature, packed into an underground storehouse. Beside the mother, on the same flat base, it grows small new bulbs called OFFSETS (or daughter bulbs), so one bulb slowly becomes a crowded clump — and every offset is a clone of the mother, ready to be split off and grown on.

Cut a garlic or onion bulb to see the structure: a flat BASAL PLATE at the bottom (a squashed stem), fleshy food-storing scales stacked above it, and a growing point in the middle. A garlic bulb shows offsets perfectly — every clove is a daughter bulb sitting on that shared basal plate. Flower bulbs like daffodils do exactly the same, just fewer and rounder.

Lift the clump when the bulb is DORMANT — for spring-flowering bulbs that means early summer, AFTER the leaves have yellowed and died back naturally. Never cut green foliage off: those leaves are busy photosynthesising to refill the bulb for next year. Fork the clump up gently so you don't slice the bulbs.

Brush off the soil and gently break the daughter offsets away from the mother at the basal plate. When they are ready they come free with a light twist; don't force any that are still firmly fused — leave those for next year.

Sort by size: big offsets will flower next year, while small bulblets need one to three years of 'growing on' before they are big enough to bloom. Throw out any soft, mouldy or damaged bulbs, let the keepers dry, and store them cool, dark and airy in a paper or mesh bag until planting time.

In autumn replant the big offsets where you want flowers and line the little ones out in a nursery bed to fatten up. The rule of thumb for depth is two to three times the bulb's own height of soil above it, pointed (growing) end UP. Label and water in.

A true BULB is one of nature's neatest storage organs: a very short, flattened stem (the basal plate) topped with swollen, food-filled leaf bases (scales) wrapped around next year's flower bud — essentially a complete plant asleep in a lunchbox. It survives the dormant season on that stored food and, in the leaf-axils on the basal plate, produces buds that swell into OFFSETS — small clone bulbs alongside the mother. Left alone these crowd into a congested clump that flowers less and less, so lifting and separating the offsets both MULTIPLIES the plant and REJUVENATES the clump, exactly as dividing a fibrous perennial does. Because it is a clone, each offset is genetically identical to its mother and comes perfectly true. The key timing rule flows from how the bulb refuels: it can only rebuild itself while its leaves are green and photosynthesising after flowering, so you must let the foliage die down naturally before you lift — cutting green leaves starves next year's bloom. Bulbs have relatives worth knowing, all lumped together by gardeners as 'bulbs' but built differently: a CORM (crocus, gladiolus) is a solid swollen stem that is used up each year and replaced by a fresh corm on top, with tiny cormels around its base; some lilies and alliums make BULBILS, little aerial bulblets on the stem or flower head; and lily growers even peel a bulb's scales off and pot them to force dozens of new bulblets ('scaling'). All of these are just variations on the same clonal trick — a storehouse organ that buds off copies of itself. Bulbs like the onion, garlic and lily have been grown and multiplied this way since antiquity.